.test{

    background-color: red;
    width: 1000px;
    height: 1000px;
    flex-direction: column-reverse ;
    .dd{
        background-color: coral;
        flex:1;
        height: 100px;
    }
    .dd2{
        background-color: cadetblue;
        flex:1;
        height: 100px;
    }
}
